注射成型水溶性陶瓷型芯技术

Injection Molding Technology of Water-soluble Ceramic Core

水溶性陶瓷型芯对于内腔结构复杂和高尺寸精度的合金铸件的精密铸造成型起着十分关键的作用。本文系统介绍了近年来国内外水溶性陶瓷型芯注射成型技术的研究进展,并重点分析了对关键工艺过程如增塑剂制备、黏结剂和陶瓷粉体组分和粒径的选择、混料工艺优化、注射成型关键参数、脱脂烧结及防水处理等对型芯微观结构、质量和性能影响,为高性能水溶性陶瓷型芯的研制提供技术指导。最后,在总结现有技术特点的基础上,分析了未来水溶性陶瓷型芯注射成型技术的发展趋势,特别是新兴的纳米材料和技术以及计算机模拟技术,将为高性能和低成本型芯的研制提供必要的支持和保障。

Water-soluble ceramic core plays a key role in investment casting,especially the castings with complex inner cavity structures or high dimensional accuracy. This paper introduces recent research progress on the water-soluble ceramic core by injection molding technology systematically. A comprehensive review is made on the research advancement on the process and their influence on the microstructure,quality and performance of the water-soluble ceramic core. The key process includes plasticizers preparation,the choice of composition as well as particle sizes of inorganic salt binder and ceramic powder,mixing process,injection molding,degreasing and sintering,waterproof treatment,etc. This review provides technical guidance for the development of high performance watersoluble ceramic core. Finally,several main development trends of the water-soluble ceramic core in the future are concluded based on the previous analysis. In particular,emerging nano-material and technology as well as computer simulation technology will provide necessary support in the development of high performance and low cost core.